You need to protect your new company logo. To do so, you’ll need to register it with the United States Patent and Trademark Office and renew it every so often. Registering and renewing involves several steps, including performing a trademark search.
The Purpose of a Trademark or Logo
Your trademark or logo is what defines your product or service and helps potential buyers recognize your company, product, or service by sight. By registering your mark, you can protect yourself and your company by having the proper paperwork in place. 
BrightHub has a trademarked logo, shown here. The idea behind having a logo is that the customer will recognize the logo and thus, recognize your brand and know who you are, what you sell, and/or what service you offer.
Create a Unique Trademark or Logo
Make sure you have fully 
defined and designed your trademark, and you believe it to be unique and unlike any other trademark used by any other company. Your trademark cannot ever be confused with any other trademark, nor should it even be close. For example, if your company name is Boca-Boca, you can’t create a logo that looks like the Coca-Cola logo and replace Coca-Cola with Boca-Boca. First, it’s unethical, second, it’ll never pass the patent search part of the application process.
Perform a Trademark Search
You have to perform a trademark search prior to filing for a trademark. A trademark search will help you decide if your logo or trademark is unique. To perform this search, go to the Trademark Electronic Search System database at the U.S. Patent and Trademark office. It’s generally best to hire a trademark attorney to help you with this.
Register your Company Logo or Trademark
Once you’re use you have a unique logo or trademark, you can attempt to register your trademark. You can file the application online using the Trademark Electronic Application System web site, part of the U.S. Patent and Trademark Office.
Note that a trademark will not be granted if your submitted trademark is similar to or may cause confusion with another registered trademark. It's very important to make sure your company logo is unique and distinct from any other registered trademark prior to filing, creating business cards or signs, or otherwise putting the logo in place.